How to distinguish the advantages and disadvantages of photographic cloth

If there is no pattern in the photography department, except for exported products, those with instructions (trademarks) and factory inspection stamps are generally the opposite. There are obvious differences between the front and back of most fabrics, but there are also many fabrics whose front and back are very similar and both sides can be used, so it is not necessary to distinguish between the front and back of this kind of fabrics.